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\section{Conclusion}
\label{sec:conclusion}

In this exploratory paper we have started by identifying the common foundational
characteristics of the emerging \emph{Model-Driven Security} concept by investigating various \mds
definitions in the literature. We then proposed the \emph{Y-Model} as a generic evaluation schema
for \mds methodologies, which incorporates the identified common characteristics. 
Afterwards we evaluated various \mds methodologies in the literature and discussed
their capabilities and drawbacks according to the Y-Model paradigm.
Furthermore, we also analyzed the trend of \mds evolution in the last decade and proposed a potential future development
approach of \mds by incorporating heterogeneity. Our \emph{Heterogeneous
Model-Driven Security} proposal is designed to enhance the modeling and security analysis capabilities,
based on fine-grained tailored \textsc{Dsl}s for each specific security concern.
